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Fix exclusive_mode on Windows (IN PROGRESS, HELP REQUESTED) #144

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Fix exclusive_mode on Windows (IN PROGRESS, HELP REQUESTED) #144

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23 changes: 16 additions & 7 deletions soundcard/mediafoundation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -499,7 +499,7 @@ def __init__(self, ptr, samplerate, channels, blocksize, isloopback, exclusive_m
if blocksize is None:
blocksize = self.deviceperiod[0]*samplerate

ppMixFormat = _ffi.new('WAVEFORMATEXTENSIBLE**')
ppMixFormat = _ffi.new('WAVEFORMATEXTENSIBLE**') # See: https://docs.microsoft.com/en-us/windows/win32/api/mmreg/ns-mmreg-waveformatextensible
hr = self._ptr[0][0].lpVtbl.GetMixFormat(self._ptr[0], ppMixFormat)
_com.check_error(hr)

Expand Down Expand Up @@ -529,16 +529,25 @@ def __init__(self, ptr, samplerate, channels, blocksize, isloopback, exclusive_m
# does not work:
# ppMixFormat[0][0].dwChannelMask=channelmask

if exclusive_mode:
streamflags = 0x00080000 # nopersist, see: https://docs.microsoft.com/en-us/windows/win32/coreaudio/audclnt-streamflags-xxx-constants
if exclusive_mode: # See: https://docs.microsoft.com/en-us/windows/win32/coreaudio/exclusive-mode-streams
sharemode = _ole32.AUDCLNT_SHAREMODE_EXCLUSIVE
periodicity = 0 # 0 uses default, must set value if using AUDCLNT_STREAMFLAGS_EVENTCALLBACK (0x00040000)
if isloopback:
raise RuntimeError("Loopback mode and exclusive mode are incompatible.")
else:
sharemode = _ole32.AUDCLNT_SHAREMODE_SHARED
# resample | remix | better-SRC | nopersist
streamflags = 0x00100000 | 0x80000000 | 0x08000000 | 0x00080000
if isloopback:
streamflags |= 0x00020000 #loopback
# resample | remix | better-SRC
# rateadjust | autoconvPCM| SRC default quality
streamflags |= 0x00100000 | 0x80000000 | 0x08000000 # these flags are only relevant/permitted for shared mode
periodicity = 0 # always 0 for shared mode
if isloopback:
streamflags |= 0x00020000 #loopback, onlly allowed for shared mode

bufferduration = int(blocksize/samplerate * 10000000) # in hecto-nanoseconds (1000_000_0)
hr = self._ptr[0][0].lpVtbl.Initialize(self._ptr[0], sharemode, streamflags, bufferduration, 0, ppMixFormat[0], _ffi.NULL)

# IAudioClient::Initialize https://docs.microsoft.com/en-us/windows/win32/api/audioclient/nf-audioclient-iaudioclient-initialize
hr = self._ptr[0][0].lpVtbl.Initialize(self._ptr[0], sharemode, streamflags, bufferduration, periodicity, ppMixFormat[0], _ffi.NULL)
_com.check_error(hr)
_ole32.CoTaskMemFree(ppMixFormat[0])

Expand Down